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Physics hw 7

# Physics hw 7 - mata(jpm2873 HW#7 Antoniewicz(57420 This...

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mata (jpm2873) – HW #7 – Antoniewicz – (57420) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001(part1of2)10.0points A 1930 kg car starts from rest and accelerates uniformly to 18 . 9 m / s in 19 s . Find the average power developed by the engine. Assume that air resistance remains constant at 397 N during this time. Answer in units of hp. 002(part2of2)10.0points Find the instantaneous power output of the engine at t = 19 s just before the car stops accelerating. Answer in units of hp. 003(part1of2)10.0points On the way to the moon, the Apollo astro- nauts reach a point where the Moon’s gravi- tational pull is stronger than that of Earth’s. Find the distance of this point from the center of the Earth. The masses of the Earth and the Moon are 5 . 98 × 10 24 kg and 7 . 36 × 10 22 kg, respectively, and the distance from the Earth to the Moon is 3 . 84 × 10 8 m. Answer in units of m. 004(part2of2)10.0points What is the acceleration due to the Earth’s gravity at this point? The value of the universal gravitational constant is 6 . 672 × 10 11 N · m 2 / kg 2 .

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